p106-100 card is exactly same chip and specifications as for gtx 1060, just a little tweaked clock and memory, you may use 1060 but why use it if you can have hands on 1080 or 1080ti,
those guys at nvidia are making us idiots, first they seperated HPC cards from gaming cards and selling them at enormously high prices, now they seperated card for mining, while actually they are same. I am a researcher, and use GPU's for superconducting simulations, I know how they fooled us by selling k80's and m60's.
because 1080 and 1080Ti aren't so good for mining, and all other cards are basically sold out.